ZH
Electrodialysis Reversal (EDR)
Description
EDR works by automatically reversing the electrode polarity during operation, typically 2 to 4 times per hour, while simultaneously changing the direction of flow for both concentrate and diluate. This process removes pollutants from the water and reduces the contamination of the membranes by divalent ions, thereby extending the service life of the ion exchange membranes.
Process
- Feedwater flows through the system.
- Automatic polarity reversal cleans the membranes.
- High-purity water and concentrated brine are separated.
Applications
- Reclaimed water/circulating water reuse;
- Desalination/hardness removal of groundwater;
- Treatment of high-hardness wastewater;
- Wastewater treatment with strict desalination requirements;
- Desalination of wastewater with high silica concentrations.
Key Advantages
High recovery rates (80–90%).
Reduced energy and chemical consumption.
strong anti-fouling capability of the ion exchange membrane.
EDR (Electrodialysis Reversal) achieves self-cleaning by periodically reversing polarity, allowing hydrated ions to migrate across the membrane surface, effectively rinsing away surface contaminants.